ci(enforce-target): treat fork-head stacked PRs as valid

Author: Wibias

.github/scripts/enforce-pr-target.test.cjs

@@ -65,6 +65,7 @@ describe("enforce-pr-target workflow", () => {
     assert.match(workflow, /stackedBase/);
     assert.match(workflow, /github\.rest\.pulls\.list/);
     assert.match(workflow, /treating as stacked/);
+    assert.match(workflow, /other\.base\?\.repo\?\.owner/);
     const qualityCall = workflow.match(
       /collectPrQualityFailures\(\{([\s\S]*?)\}\);/,
     );

.github/workflows/enforce-pr-target.yml

@@ -299,8 +299,8 @@ jobs:
                   other =>
                     other.number !== pull_number &&
                     other.head?.ref === pr.base.ref &&
-                    (other.head?.repo?.owner?.login ?? owner) === baseOwner &&
-                    (other.head?.repo?.name ?? repo) === baseName
+                    (other.base?.repo?.owner?.login ?? owner) === baseOwner &&
+                    (other.base?.repo?.name ?? repo) === baseName
                 );
                 if (stackedBase) {
                   core.info(